What are the regional and global implications for both US involvement and withdrawal?

In late November, the US reversed its sudden withdrawal from Syria and resumed operations against Daesh (ISIS) in Syria. Given the effects of US involvement or withdrawal on a number of global issues, in your assessment, should the US continue to conduct military operations against Daesh (ISIS) in Syria? What are the regional and global implications for both US involvement and withdrawal?

US Withdrawal:

https://www.nytimes.com/2019/10/07/us/politics/trump-turkey-syria.html?module=inline (Links to an external site.)

https://www.npr.org/2019/10/22/772387023/turkey-russia-reach-deal-to-control-syrian-areas-once-patrolled-by-the-u-s (Links to an external site.)

US Resumes Operations in Syria:

https://www.nytimes.com/2019/11/25/us/politics/us-syria-isis.html?actioclick&module=Top%20Stories&pgtype=Homepage (Links to an external site.)

https://www.npr.org/2019/11/13/778637632/in-syria-u-s-military-says-fight-will-continue-against-isis (Links to an external site.)

Civilian Casualties and Displacement:

https://www.bbc.com/news/world-middle-east-50503857?intlink_from_url=https://www.bbc.com/news/topics/cx1m7zg0w5zt/syria&link_location=live-reporting-story (Links to an external site.)

https://www.npr.org/sections/goatsandsoda/2019/10/25/773458865/unicefs-top-syria-official-we-have-witnessed-huge-amounts-of-distress-among-kids (Links to an external site.)